/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.google.code.motoo.filter;

import com.google.code.motoo.core.IoSession;

/**
 * 过滤器接口类
 * @author linfengqi
 *
 */
public interface Filter {
	
	/**
	 * 过滤器初始化
	 * @throws Exception
	 */
	void init() throws Exception;

	/**
	 * 过滤器销毁
	 * @throws Exception
	 */
	void destroy() throws Exception;

	/**
	 * 信息的过滤，通过FilterChain传递过滤链
	 * @param filterChain
	 * @param session
	 * @param message
	 * @throws Exception
	 */
	void doFilter(FilterChain filterChain, IoSession session, Object message) throws Exception;

}
